I see quite a few statments to "turn off the Fish icons" in the fish finder.
What's that do for me?
I see the little arc's. How's that better than a little Fish Icon?

Computer enhanced images means: The Computer sees targets. It log's that target into a Timer. It sees that target several times a second.
The Computer decides whether it's a moving target or just a bottle in suspension by watching for movment.

The arch's are a reflection with a Dot for nearly every cycle of Transducer. 400Khz is a lot of looks at the same target.

So why is the arch's better than the Icon?